@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&family=Libre+Baskerville:wght@400;700&display=swap');

:root {
  --bg-home: #f5f5f7;
  --bg-chat: #ffffff;
  --bg-sidebar: #fafafa;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-muted: #86868b;
  --border: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.12);
  --accent: #0071e3;
  --accent-light: #e8f2fe;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
  --user-bubble: #fdf3e7;
  --code-bg: var(--bg-sidebar);
  --source-tag-bg: #e8f2fe;
  --source-tag-hover: #d4e8fc;
  --web-source-bg: #f0f7ff;
  --web-source-hover: #ddeeff;
  --canvas-bg: #ffffff;
  --glass-bg: rgba(255,255,255,0.9);
  --glass-bg-strong: rgba(255,255,255,0.96);
  --glass-border: rgba(255,255,255,0.6);
  --lp-msg-user-bg: rgba(240,240,242,0.6);
  --lp-join-bg: rgba(245,245,247,0.5);
  --cover-placeholder-bg: linear-gradient(135deg, #f0f0f2, #e8e8ed);
  --cover-placeholder-color: rgba(0,0,0,0.08);
  --card-badge-ready-bg: #e3f8f0;
  --card-badge-ready-color: #15803d;
  --card-badge-catalog-bg: #e8f2fe;
  --card-badge-coming-bg: #f3f3f5;
  --card-badge-indexing-bg: #fef3cd;
  --card-badge-indexing-color: #92400e;
  --skill-rag-bg: #e3f8f0;
  --skill-rag-color: #15803d;
  --skill-content-bg: #e8f2fe;
  --skill-web-bg: #fef3cd;
  --skill-web-color: #92400e;
  --skill-llm-bg: #f3f3f5;
  --delete-color: #dc2626;
  --landing-bg: #fafbfc;
  --landing-topbar-bg: rgba(250,251,252,0.92);
  --dialog-bg: #ffffff;
  --sub-pro-bg: linear-gradient(160deg, #f0f4ff 0%, #e8eeff 50%, #dde6ff 100%);
  --sub-pro-border: rgba(102,126,234,0.25);
  --sub-pro-note: #64748b;
  --sub-pro-feature-border: rgba(102,126,234,0.08);
  --sub-pro-label: #475569;
  --btn-solid-bg: #1d1d1f;
  --btn-solid-color: #ffffff;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not(.light) {
    --bg-home: #1c1c1e;
    --bg-chat: #2c2c2e;
    --bg-sidebar: #1c1c1e;
    --text: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-muted: #8e8e93;
    --border: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.12);
    --accent: #0a84ff;
    --accent-light: rgba(10,132,255,0.15);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
    --user-bubble: #3a3a3c;
    --code-bg: #1c1c1e;
    --source-tag-bg: rgba(10,132,255,0.15);
    --source-tag-hover: rgba(10,132,255,0.25);
    --web-source-bg: rgba(10,132,255,0.12);
    --web-source-hover: rgba(10,132,255,0.22);
    --canvas-bg: #1c1c1e;
    --glass-bg: rgba(44,44,46,0.92);
    --glass-bg-strong: rgba(44,44,46,0.97);
    --glass-border: rgba(255,255,255,0.08);
    --lp-msg-user-bg: #3a3a3c;
    --lp-join-bg: #2c2c2e;
    --cover-placeholder-bg: linear-gradient(135deg, #2c2c2e, #3a3a3c);
    --cover-placeholder-color: rgba(255,255,255,0.06);
    --card-badge-ready-bg: rgba(34,197,94,0.15);
    --card-badge-ready-color: #34d399;
    --card-badge-catalog-bg: rgba(10,132,255,0.15);
    --card-badge-coming-bg: rgba(142,142,147,0.15);
    --card-badge-indexing-bg: rgba(255,214,10,0.15);
    --card-badge-indexing-color: #ffd60a;
    --skill-rag-bg: rgba(34,197,94,0.15);
    --skill-rag-color: #34d399;
    --skill-content-bg: rgba(10,132,255,0.15);
    --skill-web-bg: rgba(255,214,10,0.15);
    --skill-web-color: #ffd60a;
    --skill-llm-bg: rgba(142,142,147,0.15);
    --delete-color: #ff453a;
    --landing-bg: #1c1c1e;
    --landing-topbar-bg: rgba(28,28,30,0.92);
    --dialog-bg: #2c2c2e;
    --sub-pro-bg: linear-gradient(160deg, #1e2340 0%, #1a2038 50%, #161a30 100%);
    --sub-pro-border: rgba(102,126,234,0.35);
    --sub-pro-note: #8e8e93;
    --sub-pro-feature-border: rgba(102,126,234,0.15);
    --sub-pro-label: #a1a1a6;
    --btn-solid-bg: #f5f5f7;
    --btn-solid-color: #1c1c1e;
  }
}

:root.dark {
  --bg-home: #1c1c1e;
  --bg-chat: #2c2c2e;
  --bg-sidebar: #1c1c1e;
  --text: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-muted: #8e8e93;
  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.12);
  --accent: #0a84ff;
  --accent-light: rgba(10,132,255,0.15);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  --user-bubble: #3a3a3c;
  --code-bg: #1c1c1e;
  --source-tag-bg: rgba(10,132,255,0.15);
  --source-tag-hover: rgba(10,132,255,0.25);
  --web-source-bg: rgba(10,132,255,0.12);
  --web-source-hover: rgba(10,132,255,0.22);
  --canvas-bg: #1c1c1e;
  --glass-bg: rgba(44,44,46,0.9);
  --glass-bg-strong: rgba(44,44,46,0.96);
  --glass-border: rgba(255,255,255,0.08);
  --lp-msg-user-bg: #3a3a3c;
  --lp-join-bg: #2c2c2e;
  --cover-placeholder-bg: linear-gradient(135deg, #2c2c2e, #3a3a3c);
  --cover-placeholder-color: rgba(255,255,255,0.06);
  --card-badge-ready-bg: rgba(34,197,94,0.15);
  --card-badge-ready-color: #34d399;
  --card-badge-catalog-bg: rgba(10,132,255,0.15);
  --card-badge-coming-bg: rgba(142,142,147,0.15);
  --card-badge-indexing-bg: rgba(255,214,10,0.15);
  --card-badge-indexing-color: #ffd60a;
  --skill-rag-bg: rgba(34,197,94,0.15);
  --skill-rag-color: #34d399;
  --skill-content-bg: rgba(10,132,255,0.15);
  --skill-web-bg: rgba(255,214,10,0.15);
  --skill-web-color: #ffd60a;
  --skill-llm-bg: rgba(142,142,147,0.15);
  --delete-color: #ff453a;
  --landing-bg: #1c1c1e;
  --landing-topbar-bg: rgba(28,28,30,0.92);
  --dialog-bg: #2c2c2e;
  --sub-pro-bg: linear-gradient(160deg, #1e2340 0%, #1a2038 50%, #161a30 100%);
  --sub-pro-border: rgba(102,126,234,0.35);
  --sub-pro-note: #8e8e93;
  --sub-pro-feature-border: rgba(102,126,234,0.15);
  --sub-pro-label: #a1a1a6;
  --btn-solid-bg: #f5f5f7;
  --btn-solid-color: #1c1c1e;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.page-view { display: block; }
.hidden { display: none !important; }

/* ═══════════════════════════════════════
   APP LAYOUT — Sidebar + Main
   ═══════════════════════════════════════ */
.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ─── Global Sidebar ─── */
.app-sidebar {
  width: 260px; flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: var(--bg-sidebar);
  display: flex; flex-direction: column;
  overflow: hidden;
  transition: width 0.2s ease;
}

/* ─── Collapsed sidebar: narrow icon strip ─── */
.app-layout.sidebar-collapsed .app-sidebar {
  width: 52px;
}
.app-layout.sidebar-collapsed .sidebar-logo { font-size: 0; gap: 0; cursor: pointer; }
.app-layout.sidebar-collapsed .sidebar-logo-icon { display: block; }
.app-layout.sidebar-collapsed .sidebar-label { display: none; }
.app-layout.sidebar-collapsed #sidebar-toggle-btn { display: none; }
.app-layout.sidebar-collapsed .sidebar-header {
  justify-content: center; padding: 14px 0 10px;
}
.app-layout.sidebar-collapsed .new-chat-action {
  justify-content: center; padding: 8px; margin: 0 8px 4px;
}
.app-layout.sidebar-collapsed .sidebar-chats-link {
  justify-content: center; padding: 8px; margin: 0 8px 4px;
}
.app-layout.sidebar-collapsed .sidebar-library-link {
  justify-content: center; padding: 8px; margin: 0 8px 4px;
}
.app-layout.sidebar-collapsed .sidebar-minds-link {
  justify-content: center; padding: 8px; margin: 0 8px 4px;
}
.app-layout.sidebar-collapsed .sidebar-profile .sidebar-label {
  display: none;
}
.app-layout.sidebar-collapsed .sidebar-history { display: none; }
.app-layout.sidebar-collapsed .sidebar-bottom {
  margin-top: auto;
  padding: 12px 0;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  justify-content: center;
}

.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 12px 10px 16px; flex-shrink: 0;
}
.sidebar-logo {
  font-size: 17px; font-weight: 500; letter-spacing: 0.02em;
  text-decoration: none; color: var(--text);
  white-space: nowrap;
  font-family: 'Libre Baskerville', Georgia, serif;
  display: flex; align-items: center; gap: 7px;
}
.sidebar-logo:hover { color: var(--text-secondary); }
.sidebar-logo-icon { flex-shrink: 0; }

.sidebar-icon-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px; border: none;
  background: transparent; color: var(--text-muted); cursor: pointer;
  transition: all 0.15s; flex-shrink: 0;
}
.sidebar-icon-btn:hover { color: var(--text); background: rgba(128,128,128,0.1); }

.new-chat-action {
  display: flex; align-items: center; gap: 8px;
  margin: 0 12px 4px; padding: 8px 12px;
  border-radius: 8px; border: none;
  background: transparent; color: var(--text);
  font-size: 13px; font-weight: 500; font-family: 'Libre Baskerville', Georgia, serif;
  cursor: pointer; transition: all 0.15s;
  white-space: nowrap;
}
.new-chat-action:hover { background: rgba(128,128,128,0.08); }
.new-chat-action svg { flex-shrink: 0; color: var(--text-muted); }

/* Library link in sidebar (below New Chat) */
.sidebar-library-link {
  margin: 0 12px 8px; padding: 8px 12px;
  border-radius: 8px;
  display: flex; align-items: center; gap: 8px;
  color: var(--text-muted); text-decoration: none;
  font-size: 13px; font-weight: 500; font-family: 'Libre Baskerville', Georgia, serif;
  transition: all 0.15s; white-space: nowrap;
}
.sidebar-library-link:hover { color: var(--text); background: rgba(128,128,128,0.08); }

/* Chats link in sidebar */
.sidebar-chats-link {
  margin: 0 12px 4px; padding: 8px 12px;
  border-radius: 8px; border: none; background: transparent;
  display: flex; align-items: center; gap: 8px;
  color: var(--text-muted); text-decoration: none;
  font-size: 13px; font-weight: 500; font-family: 'Libre Baskerville', Georgia, serif;
  cursor: pointer; transition: all 0.15s; white-space: nowrap;
}
.sidebar-chats-link:hover { color: var(--text); background: rgba(128,128,128,0.08); }
.sidebar-chats-link svg { flex-shrink: 0; }

/* Great Minds link in sidebar */
.sidebar-minds-link {
  margin: 0 12px 8px; padding: 8px 12px;
  border-radius: 8px;
  display: flex; align-items: center; gap: 8px;
  color: var(--text-muted); text-decoration: none;
  font-size: 13px; font-weight: 500; font-family: 'Libre Baskerville', Georgia, serif;
  transition: all 0.15s; white-space: nowrap;
}
.sidebar-minds-link:hover { color: var(--text); background: rgba(128,128,128,0.08); }
.sidebar-minds-link svg { flex-shrink: 0; }

.profile-info {
  display: flex; flex-direction: column; min-width: 0;
}
.profile-name {
  font-size: 13px; font-weight: 500; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.profile-tier {
  font-size: 11px; color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.sidebar-history {
  flex: 1; overflow-y: auto; padding: 4px 8px 0;
  border-top: 1px solid var(--border);
  margin-top: 4px;
}
.history-item-wrap {
  display: flex; align-items: center;
  border-radius: 8px; margin-bottom: 2px;
  transition: background 0.15s;
}
.history-item-wrap:hover { background: rgba(128,128,128,0.08); }
.history-item-wrap.active { background: rgba(128,128,128,0.12); }
.history-item {
  flex: 1; min-width: 0;
  padding: 8px 12px; border-radius: 8px; border: none;
  background: transparent; color: var(--text);
  font-size: 13px; text-align: left; cursor: pointer;
  font-family: inherit;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.history-item-wrap.active .history-item { font-weight: 500; }
.history-delete {
  flex-shrink: 0; width: 24px; height: 24px;
  border: none; background: transparent; color: var(--text-muted);
  font-size: 14px; cursor: pointer; border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.15s;
}
.history-item-wrap:hover .history-delete { opacity: 0.6; }
.history-delete:hover { opacity: 1 !important; color: var(--delete-color); }

.sidebar-bottom {
  margin-top: auto;
  padding: 12px 16px; border-top: 1px solid var(--border); flex-shrink: 0;
  display: flex; align-items: center; justify-content: space-between;
}
.sidebar-user-wrap {
  position: relative;
}
.sidebar-profile {
  display: flex; align-items: center; gap: 10px;
  cursor: pointer; padding: 4px; border-radius: 10px;
  transition: background 0.15s;
}
.sidebar-profile:hover { background: rgba(128,128,128,0.08); }
.profile-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); cursor: pointer;
  transition: background 0.15s; flex-shrink: 0;
}
.profile-avatar:hover { background: rgba(128,128,128,0.2); }

/* User popup menu */
.sidebar-user-menu {
  display: none; position: fixed;
  min-width: 220px; background: var(--bg-chat);
  border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow-lg, 0 8px 32px rgba(0,0,0,0.18));
  z-index: 1000; padding: 6px;
  animation: userMenuIn 0.15s ease-out;
}
.sidebar-user-menu.open { display: block; }
@keyframes userMenuIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.user-menu-header {
  padding: 10px 12px 8px; display: flex; flex-direction: column; gap: 2px;
}
.user-menu-name {
  font-size: 13px; font-weight: 600; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.user-menu-email {
  font-size: 11px; color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.user-menu-divider {
  height: 1px; background: var(--border); margin: 4px 8px;
}
.user-menu-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px; border-radius: 8px;
  font-size: 13px; color: var(--text); text-decoration: none;
  cursor: pointer; transition: background 0.12s;
  background: none; border: none; width: 100%; text-align: left;
  font-family: inherit;
}
.user-menu-item:hover { background: rgba(128,128,128,0.08); }
.user-menu-item svg { flex-shrink: 0; color: var(--text-muted); }
.user-menu-signout { color: var(--delete-color, #ef4444); }
.user-menu-signout svg { color: var(--delete-color, #ef4444); }

/* Floating sidebar button (mobile only when collapsed) */
.sidebar-float-btn {
  position: fixed; top: 16px; left: 16px; z-index: 50;
  width: 32px; height: 32px;
  display: none; align-items: center; justify-content: center;
  border-radius: 8px; border: none;
  background: var(--bg-chat); color: var(--text-muted);
  cursor: pointer; transition: all 0.15s;
  box-shadow: var(--shadow-sm);
}
.sidebar-float-btn:hover { color: var(--text); background: rgba(128,128,128,0.08); }

/* ─── Main Content Area ─── */
.app-main {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column;
  overflow: hidden; position: relative;
}

/* ═══════════════════════════════════════
   HOMEPAGE — Apple white, centered
   ═══════════════════════════════════════ */
.home-page {
  flex: 1;
  background: var(--bg-home);
  display: flex; flex-direction: column;
  overflow-y: auto;
}

.home-center {
  flex: 1;
  display: flex; flex-direction: column;
  align-items: stretch;
  justify-content: center;
  padding: 0 24px;
  max-width: 660px;
  width: 100%; margin: 0 auto;
  margin-top: -80px;
}

.greeting-row {
  display: flex; align-items: center; justify-content: center;
  gap: 12px; margin-bottom: 24px;
}
.greeting-logo-wrap {
  position: relative; flex-shrink: 0;
  width: 42px; height: 42px;
}
.greeting-logo-wrap .greeting-logo,
.greeting-logo-wrap .greeting-feynman-logo {
  position: absolute; top: 0; left: 0;
  transition: opacity 0.15s, transform 0.15s;
}
.greeting-logo-wrap .greeting-feynman-logo {
  opacity: 0; transform: scale(0.6);
  color: var(--text-secondary);
}
.greeting-logo-wrap.swap .greeting-logo {
  opacity: 0; transform: scale(0.6);
}
.greeting-logo-wrap.swap .greeting-feynman-logo {
  opacity: 1; transform: scale(1);
}
.greeting-logo-wrap.bounce {
  animation: greetingBounce 0.5s cubic-bezier(.36,.07,.19,.97) both;
}
@keyframes greetingBounce {
  0%   { transform: translateY(0); }
  25%  { transform: translateY(-8px) rotate(-4deg); }
  50%  { transform: translateY(0) rotate(2deg); }
  75%  { transform: translateY(-3px) rotate(0); }
  100% { transform: translateY(0); }
}
.greeting {
  font-size: 36px; font-weight: 400; letter-spacing: -0.01em;
  color: var(--text);
  font-family: 'Libre Baskerville', Georgia, serif;
}

/* ─── Composer (shared) ─── */
.chat-composer, .chat-composer-inline {
  width: 100%;
  background: var(--bg-chat);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 16px 18px 10px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.chat-composer:focus-within, .chat-composer-inline:focus-within {
  border-color: rgba(0,113,227,0.35);
  box-shadow: var(--shadow-md), 0 0 0 3px rgba(0,113,227,0.06);
}

.composer-input {
  width: 100%; border: none; outline: none; resize: none;
  background: transparent; color: var(--text);
  font-size: 16px; font-family: inherit; line-height: 1.5;
  min-height: 40px; max-height: 200px;
}
.composer-input::placeholder { color: var(--text-muted); }

.composer-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 6px;
}
.composer-left { display: flex; gap: 4px; position: relative; }

/* + button — bare, no border */
.composer-icon-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: none;
  background: transparent; color: var(--text-muted); cursor: pointer;
  transition: all 0.15s;
}
.composer-icon-btn:hover {
  color: var(--text); background: rgba(128,128,128,0.08);
}
.composer-minds-btn { color: var(--text-secondary); }
.composer-minds-btn:hover { color: var(--accent); background: rgba(100,120,180,0.08); }

.composer-send-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: none;
  background: var(--btn-solid-bg); color: var(--btn-solid-color); cursor: pointer;
  transition: opacity 0.15s;
}
.composer-send-btn:hover { opacity: 0.8; }
.composer-send-btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* ─── @mention autocomplete ─── */
.mention-dropdown {
  position: absolute;
  bottom: 100%;
  left: 0;
  min-width: 220px;
  max-width: 320px;
  max-height: 200px;
  overflow-y: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  z-index: 200;
  padding: 4px;
  margin-bottom: 8px;
  scrollbar-width: thin;
}
.mention-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s;
}
.mention-item:hover, .mention-item.active {
  background: rgba(0,113,227,0.08);
}
.mention-item-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  flex-shrink: 0;
}
.mention-item-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.mention-item-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mention-item-domain {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mention-tag {
  color: var(--accent);
  font-weight: 600;
}

/* ─── Starter questions ─── */
.home-starters {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center; margin-top: 16px;
}
.home-starters:empty { display: none; margin: 0; }
.starter-pill {
  padding: 8px 16px; border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--bg-chat); color: var(--text);
  font-size: 13px; font-family: inherit;
  cursor: pointer; transition: all 0.15s;
  line-height: 1.4; max-width: 340px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; text-overflow: ellipsis;
}
.starter-pill:hover {
  border-color: var(--accent); color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.home-hint {
  margin-top: 16px; font-size: 13px; color: var(--text-muted);
  text-align: center;
}
.hint-link {
  color: var(--accent); text-decoration: none; font-weight: 500;
}
.hint-link:hover { text-decoration: underline; }
.home-status {
  margin-top: 8px; font-size: 13px; color: var(--accent);
  min-height: 20px; text-align: center;
}

/* ─── Upload Toast ─── */
.upload-toast {
  position: absolute; top: 16px; left: 50%; transform: translateX(-50%) translateY(-20px);
  z-index: 500; display: flex; align-items: center; gap: 10px;
  padding: 12px 28px; border-radius: 14px;
  width: max-content; min-width: 280px; max-width: 460px;
  background: rgba(245,245,247,0.72);
  backdrop-filter: blur(24px) saturate(1.5); -webkit-backdrop-filter: blur(24px) saturate(1.5);
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 4px 24px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.04);
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.upload-toast.visible {
  opacity: 1; pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.upload-toast.hiding {
  opacity: 0; transform: translateX(-50%) translateY(-12px);
}
@media (prefers-color-scheme: dark) {
  :root:not(.light) .upload-toast {
    background: rgba(40,40,46,0.5);
    border-color: rgba(255,255,255,0.1);
    box-shadow: 0 4px 24px rgba(0,0,0,0.2);
  }
}
:root.dark .upload-toast {
  background: rgba(40,40,46,0.5);
  border-color: rgba(255,255,255,0.1);
  box-shadow: 0 4px 24px rgba(0,0,0,0.2);
}
.upload-toast-spinner {
  width: 16px; height: 16px; border-radius: 50%; flex-shrink: 0;
  border: 2px solid color-mix(in srgb, var(--accent) 25%, transparent);
  border-top-color: var(--accent);
  animation: toast-spin 0.7s linear infinite;
}
.upload-toast.success .upload-toast-spinner,
.upload-toast.error .upload-toast-spinner { animation: none; border: none; }
.upload-toast.success .upload-toast-spinner::after,
.upload-toast.error .upload-toast-spinner::after {
  display: block; text-align: center; line-height: 16px; font-size: 14px;
}
.upload-toast.success .upload-toast-spinner { color: #27ae60; }
.upload-toast.success .upload-toast-spinner::after { content: "\2713"; }
.upload-toast.error .upload-toast-spinner { color: #e74c3c; }
.upload-toast.error .upload-toast-spinner::after { content: "\2715"; }
@keyframes toast-spin { to { transform: rotate(360deg); } }
.upload-toast-text {
  font-size: 13px; font-weight: 500; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 380px;
}

/* ─── Onboarding ─── */
.onboarding { text-align: center; }
.onboarding-subtitle { font-size: 18px; color: var(--text-secondary); margin-bottom: 24px; }
.onboarding-body { max-width: 480px; margin: 0 auto; }
.onboarding-input {
  width: 280px; padding: 12px 16px; border-radius: 12px;
  border: 1px solid var(--border-strong); background: var(--bg-chat);
  font-size: 16px; text-align: center; font-family: inherit;
  color: var(--text); outline: none;
  transition: border-color 0.2s;
}
.onboarding-input:focus { border-color: rgba(0,113,227,0.4); }
.onboarding-input::placeholder { color: var(--text-muted); }
.onboarding-btn {
  padding: 10px 32px; border-radius: 999px; border: none;
  background: var(--btn-solid-bg); color: var(--btn-solid-color);
  font-size: 14px; font-weight: 600; font-family: inherit;
  cursor: pointer; margin-top: 16px;
  transition: opacity 0.15s;
}
.onboarding-btn:hover { opacity: 0.85; }
.onboarding-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ─── Login / Sign-up Page ─── */
.login-page {
  background: var(--bg-home); flex: 1;
}
.login-container {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 100%; padding: 40px 20px;
}
.login-card {
  width: 100%; max-width: 400px;
  background: var(--bg-chat);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px 36px 36px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.08);
}
.login-brand {
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
}
.login-welcome {
  font-family: 'Libre Baskerville', Georgia, serif;
  font-size: 24px; font-weight: 400; text-align: center;
  color: var(--text); margin: 0 0 6px; line-height: 1.3;
}
.login-welcome-brand { font-weight: 700; }
.login-subtitle {
  font-size: 14px; color: var(--text-muted); text-align: center;
  margin: 0 0 32px; font-weight: 400;
}
.login-google {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  width: 100%; padding: 13px 20px;
  border: 1px solid var(--border-strong, #d1d5db); border-radius: 12px;
  background: #fff; color: #3c4043;
  font-size: 15px; font-weight: 500; font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.login-google:hover {
  background: #f8f9fa;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}
.login-google svg { flex-shrink: 0; }
.auth-error {
  color: var(--delete-color); font-size: 13px; text-align: center;
  min-height: 0; word-break: break-word;
}
.auth-error:not(:empty) { margin-top: 10px; }
.auth-success {
  color: var(--card-badge-ready-color); font-size: 13px; text-align: center;
  min-height: 0; word-break: break-word;
}
.auth-success:not(:empty) { margin-top: 10px; }
.login-divider {
  display: flex; align-items: center; gap: 12px;
  margin: 24px 0 4px; color: var(--text-muted); font-size: 12px;
  user-select: none;
}
.login-divider:hover { color: var(--text-secondary); }
.login-divider::before, .login-divider::after {
  content: ''; flex: 1; height: 1px;
  background: var(--border, #d1d5db);
}
.login-email-section {
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.25s ease;
  max-height: 400px; opacity: 1;
}
.login-email-collapsed {
  max-height: 0; opacity: 0;
}
.login-form {
  display: flex; flex-direction: column; gap: 12px;
  padding-top: 16px;
}
.login-field { display: flex; flex-direction: column; }
.login-input {
  width: 100%; padding: 11px 14px; border-radius: 10px;
  border: 1px solid var(--border-strong); background: var(--bg-chat);
  font-size: 14px; font-family: inherit; color: var(--text);
  outline: none; box-sizing: border-box;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.login-input:focus {
  border-color: rgba(0,113,227,0.5);
  box-shadow: 0 0 0 3px rgba(0,113,227,0.1);
}
.login-input::placeholder { color: var(--text-muted); }
.login-submit {
  width: 100%; padding: 11px 0; border-radius: 10px; border: none;
  font-size: 14px; font-weight: 600; font-family: inherit;
  cursor: pointer; margin-top: 4px;
  transition: opacity 0.15s;
}
.login-submit-secondary {
  background: var(--bg-hover, #f3f4f6);
  color: var(--text);
  border: 1px solid var(--border);
}
.login-submit-secondary:hover { opacity: 0.8; }
.login-oauth-terms {
  font-size: 11px; color: #999; text-align: center;
  margin: 6px 0 0; line-height: 1.4;
}
.login-oauth-terms a { color: #999; text-decoration: underline; }
.login-oauth-terms a:hover { color: #ccc; }
.login-submit:disabled { opacity: 0.5; cursor: not-allowed; }
.login-terms {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: 12px; color: var(--text-muted); margin-top: 8px;
  cursor: pointer; line-height: 1.5;
}
.login-terms input[type="checkbox"] {
  margin-top: 3px; accent-color: var(--accent, #0071e3); flex-shrink: 0;
}
.login-terms a { color: var(--accent, #0071e3); text-decoration: underline; }
.login-toggle {
  font-size: 13px; color: var(--text-muted); text-align: center;
  margin: 14px 0 0;
}
.login-toggle a {
  color: var(--accent, #0071e3); font-weight: 600;
  text-decoration: none; margin-left: 4px;
}
.login-toggle a:hover { text-decoration: underline; }
.login-back {
  margin-top: 24px; font-size: 13px;
  color: var(--text-muted); text-decoration: none;
  transition: color 0.15s;
}
.login-back:hover { color: var(--text); }

.onboarding-topics {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center; margin-bottom: 20px;
}
.onboarding-topics .topic-tag.selected {
  background: var(--btn-solid-bg); color: var(--btn-solid-color); border-color: var(--btn-solid-bg);
}

.home-quote {
  padding: 20px 32px;
  text-align: center;
  font-size: 12px; font-style: italic;
  color: var(--text-muted); letter-spacing: 0.01em;
}

/* ═══════════════════════════════════════
   CHAT PAGE — Main + Right sidebar
   ═══════════════════════════════════════ */
.chat-page {
  flex: 1; display: flex; flex-direction: column;
  background: var(--bg-chat);
  overflow: hidden;
}

.chat-with-sidebar {
  flex: 1; display: flex; overflow: hidden;
}

/* Right sidebar — hidden by default, shown when has content */
.chat-sidebar-right {
  width: 260px; flex-shrink: 0;
  border-left: 1px solid var(--border);
  background: var(--bg-sidebar);
  padding: 20px; overflow-y: auto;
  display: none;
}
.chat-sidebar-right.visible {
  display: block;
}
/* Book detail page right sidebar always visible */
.book-detail-layout > .chat-sidebar-right {
  display: block;
}

.sidebar-title {
  font-size: 11px; font-weight: 600; letter-spacing: 0.1em;
  color: var(--text-muted); margin-bottom: 12px;
}
.sidebar-list { display: flex; flex-direction: column; gap: 8px; }

.sidebar-book-item {
  display: flex; gap: 10px; align-items: center;
  padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-chat); cursor: pointer;
  text-decoration: none; color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.sidebar-book-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}
.sidebar-book-cover {
  width: 36px; height: 48px; border-radius: 4px;
  object-fit: cover; background: var(--bg-sidebar); flex-shrink: 0;
}
.sidebar-book-info { flex: 1; min-width: 0; }
.sidebar-book-title {
  font-size: 13px; font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.sidebar-book-author {
  font-size: 11px; color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

/* Main chat area */
.chat-main {
  flex: 1; display: flex; flex-direction: column;
  min-width: 0; min-height: 0; overflow: hidden;
}
.chat-messages {
  flex: 1; padding: 24px 32px;
  max-width: 780px; width: 100%; margin: 0 auto;
  min-height: 0; overflow-y: auto;
  scrollbar-width: thin; scrollbar-color: rgba(128,128,128,0.2) transparent;
}
.chat-messages::-webkit-scrollbar { width: 6px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: rgba(128,128,128,0.2); border-radius: 3px; }
.chat-messages::-webkit-scrollbar-thumb:hover { background: rgba(128,128,128,0.35); }
.chat-input-area {
  padding: 12px 32px 20px;
  flex-shrink: 0;
  background: var(--bg-chat);
}
.chat-composer-inline {
  max-width: 720px; margin: 0 auto;
}

/* Messages */
.chat-message {
  font-size: 14px; line-height: 1.7; word-break: break-word; margin-bottom: 24px;
}
.chat-message.user {
  margin-top: 8px;
}
.chat-message.user {
  font-weight: 500; white-space: pre-wrap;
  color: var(--text);
  background: var(--user-bubble); border-radius: 18px;
  padding: 10px 16px; margin-left: auto;
  max-width: 85%; width: fit-content;
}
.chat-message.assistant {
  color: var(--text);
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.feynman-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
  background: var(--accent);
  color: #fff;
}
.feynman-msg-body {
  flex: 1;
  min-width: 0;
}
.feynman-msg-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  line-height: 1;
  margin-bottom: 4px;
}
.msg-content p { margin: 0 0 8px; }
.msg-content p:last-child { margin-bottom: 0; }
.msg-content strong { color: var(--text); font-weight: 600; }
.msg-content code { background: var(--code-bg); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; }
.msg-content pre { background: var(--code-bg); padding: 12px 16px; border-radius: 8px; overflow-x: auto; margin: 8px 0; }
.msg-content pre code { background: none; padding: 0; }
.msg-content ul, .msg-content ol { margin: 6px 0; padding-left: 20px; }
.msg-content li { margin-bottom: 4px; }
.msg-content h2, .msg-content h3, .msg-content h4 { color: var(--text); margin: 12px 0 6px; }
.msg-content a { color: var(--accent); text-decoration: underline; }
.chat-message .source-tags {
  display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px;
}
.source-tag {
  padding: 4px 12px; border-radius: 999px; font-size: 12px;
  background: var(--source-tag-bg); color: var(--accent);
  cursor: pointer; text-decoration: none; font-weight: 500;
}
.source-tag:hover { background: var(--source-tag-hover); }

/* Web sources (grounding citations) */
.web-sources {
  display: flex; flex-direction: column; gap: 6px;
  margin-top: 12px; padding-top: 10px;
  border-top: 1px solid var(--border);
}
.web-search-badge {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 11px; font-weight: 500; color: var(--text-muted);
  padding: 2px 0;
}
.web-search-badge svg { opacity: 0.6; }
.web-source-link {
  display: inline-block;
  padding: 4px 10px; border-radius: 6px;
  font-size: 12px; font-weight: 500;
  background: var(--web-source-bg); color: var(--accent);
  text-decoration: none;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 100%; transition: background 0.15s;
}
.web-source-link:hover { background: var(--web-source-hover); text-decoration: underline; }
.web-source-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent); color: #fff; font-size: 10px; font-weight: 600;
  margin-right: 4px; flex-shrink: 0;
}
.cite-group { white-space: nowrap; }
.cite-link { color: var(--accent); text-decoration: none; cursor: pointer; }
.cite-link:hover { text-decoration: underline; }
.cite-link sup { font-size: 0.75em; font-weight: 600; }
.msg-references {
  margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--border);
}
.refs-header { font-size: 11px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }
.ref-group { padding: 8px 0; }
.ref-group + .ref-group { border-top: 1px solid var(--border); }
.ref-group-header { display: flex; align-items: center; gap: 5px; margin-bottom: 4px; }
.ref-num {
  flex-shrink: 0; width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent-light); color: var(--accent); font-size: 10px; font-weight: 600;
  display: inline-flex; align-items: center; justify-content: center;
}
.ref-book { font-size: 12px; font-weight: 600; color: var(--text); }
.ref-snippets { padding-left: 4px; }
.ref-snippet-row { display: flex; gap: 6px; align-items: flex-start; padding: 3px 0; }
.ref-snippet-row.expandable { cursor: pointer; border-radius: 6px; padding: 4px 6px; margin: 1px -6px; transition: background 0.15s; }
.ref-snippet-row.expandable:hover { background: rgba(0,0,0,0.03); }
.ref-snippet-num {
  flex-shrink: 0; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent-light); color: var(--accent); font-size: 9px; font-weight: 600;
  display: inline-flex; align-items: center; justify-content: center; margin-top: 1px;
}
.ref-snippet { font-size: 11px; color: var(--text-muted); line-height: 1.4; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; flex: 1; min-width: 0; }
.ref-expand-icon { flex-shrink: 0; font-size: 8px; color: var(--text-muted); margin-top: 2px; transition: transform 0.2s; }
.ref-snippet-row.expanded .ref-expand-icon { transform: rotate(90deg); }
.ref-snippet-row.expanded .ref-snippet { -webkit-line-clamp: unset; display: block; white-space: pre-wrap; }

/* ─── Page nav (book detail) ─── */
.page-nav {
  display: flex; align-items: center;
  padding: 12px 24px; flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.nav-link-back {
  color: var(--text-muted); text-decoration: none;
  font-size: 13px; font-weight: 500;
}
.nav-link-back:hover { color: var(--text); }

/* Book inline header (in book detail chat) */
.book-inline-header {
  max-width: 720px; margin: 20px auto 0;
  padding: 16px 20px; border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-sidebar);
  display: flex; gap: 16px; align-items: center;
}
.book-inline-header:empty { display: none; }
.book-inline-cover {
  width: 48px; height: 64px; border-radius: 6px;
  object-fit: cover; flex-shrink: 0;
}
.book-inline-info h2 {
  font-size: 16px; font-weight: 600; margin-bottom: 2px;
}
.book-inline-info p {
  font-size: 13px; color: var(--text-muted);
}

/* Book detail layout */
.book-page {
  flex: 1; display: flex; flex-direction: column;
  background: var(--bg-chat); overflow: hidden;
}
.book-detail-layout {
  flex: 1; display: flex; overflow: hidden;
}
.book-sidebar-left {
  width: 260px; flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: var(--bg-sidebar);
  padding: 20px; overflow-y: auto;
}

/* Book questions in sidebar */
.book-questions-sidebar { margin-top: 8px; }
.book-questions-sidebar h4 {
  font-size: 11px; font-weight: 600; letter-spacing: 0.1em;
  color: var(--text-muted); margin-bottom: 10px;
}
.sidebar-question {
  display: block; width: 100%;
  padding: 10px 12px; margin-bottom: 6px;
  border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-chat); color: var(--text);
  font-size: 12px; line-height: 1.4;
  text-align: left; cursor: pointer;
  font-family: inherit; transition: all 0.15s;
}
.sidebar-question:hover {
  border-color: var(--accent); background: var(--accent-light);
}

/* ═══════════════════════════════════════
   LIBRARY PAGE
   ═══════════════════════════════════════ */
.library-page {
  flex: 1; display: flex; flex-direction: column;
  background: var(--bg-home); overflow-y: auto;
}
.library-content {
  max-width: 1100px; margin: 0 auto;
  padding: 32px 32px 64px;
  width: 100%;
}
.page-title {
  font-size: 32px; font-weight: 400;
  letter-spacing: -0.01em; margin-bottom: 24px;
  font-family: 'Libre Baskerville', Georgia, serif;
}
.library-toolbar {
  display: flex; gap: 16px; align-items: center;
  margin-bottom: 24px; flex-wrap: wrap;
}
.library-toolbar input {
  flex: 1; min-width: 200px; padding: 10px 16px;
  border-radius: 10px; border: 1px solid var(--border-strong);
  background: var(--bg-chat); color: var(--text);
  font-size: 14px; font-family: inherit;
}
.library-toolbar input::placeholder { color: var(--text-muted); }
.filter-tags { display: flex; gap: 6px; }
.filter-tag {
  padding: 7px 16px; border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: transparent; color: var(--text-muted);
  font-weight: 500; font-size: 13px; cursor: pointer;
  font-family: inherit; transition: all 0.15s;
}
.filter-tag:hover { color: var(--text); border-color: rgba(128,128,128,0.3); }
.filter-tag.active {
  background: var(--btn-solid-bg); color: var(--btn-solid-color);
  border-color: var(--btn-solid-bg);
}

/* Book grid */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.book-card {
  background: var(--bg-chat);
  border: 1px solid var(--border);
  border-radius: 14px; overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column;
  cursor: pointer; transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
}
.book-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.card-cover {
  width: 100%; height: 200px; object-fit: cover;
  background: var(--bg-sidebar);
}
.card-cover-placeholder {
  width: 100%; height: 200px;
  display: flex; align-items: center; justify-content: center;
  background: var(--cover-placeholder-bg);
  font-size: 48px; color: var(--cover-placeholder-color);
}
.card-cover-gen {
  width: 100%; height: 200px;
  display: flex; align-items: center; justify-content: center;
}
.card-cover-gen span {
  font-size: 48px; font-weight: 700; letter-spacing: 0.05em;
  color: rgba(255,255,255,0.3);
}
.card-body {
  padding: 12px 14px; flex: 1;
  display: flex; flex-direction: column; gap: 4px;
}
.card-title {
  font-size: 14px; font-weight: 600; line-height: 1.3;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.card-author {
  font-size: 12px; color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.card-footer {
  padding: 6px 14px 10px;
  display: flex; align-items: center; justify-content: space-between;
}
.card-badge {
  font-size: 11px; font-weight: 600; padding: 2px 8px;
  border-radius: 999px;
}
.card-badge.ready { background: var(--card-badge-ready-bg); color: var(--card-badge-ready-color); }
.card-badge.catalog { background: var(--card-badge-catalog-bg); color: var(--accent); }
.card-badge.coming { background: var(--card-badge-coming-bg); color: var(--text-muted); }
.card-badge.indexing { background: var(--card-badge-indexing-bg); color: var(--card-badge-indexing-color); }

.card-chat-btn {
  padding: 4px 12px; border-radius: 999px; border: none;
  background: var(--accent); color: #fff;
  font-size: 12px; font-weight: 600; cursor: pointer;
  font-family: inherit; transition: opacity 0.15s;
}
.card-chat-btn:hover { opacity: 0.85; }

/* Delete button on uploaded book cards */
.card-delete-btn {
  position: absolute; top: 8px; right: 8px;
  width: 24px; height: 24px; border-radius: 50%;
  border: none; background: rgba(0,0,0,0.5); color: #fff;
  font-size: 14px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.15s;
}
.book-card:hover .card-delete-btn { opacity: 1; }
.card-delete-btn:hover { background: rgba(255,69,58,0.8); }

.upvote-btn {
  display: flex; align-items: center; gap: 3px;
  padding: 3px 8px; border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent; color: var(--text-muted);
  font-size: 11px; cursor: pointer; transition: all 0.15s;
}
.upvote-btn:hover {
  color: var(--accent); border-color: var(--accent);
}

/* ─── Popover (+ button menu) ─── */
.composer-popover {
  position: absolute; bottom: 100%; left: 0; margin-bottom: 8px;
  background: var(--bg-chat); border: 1px solid var(--border-strong);
  border-radius: 12px; box-shadow: var(--shadow-lg);
  min-width: 240px; max-height: 320px; overflow-y: auto;
  z-index: 100; padding: 6px;
}
.popover-action {
  display: flex; align-items: center; gap: 8px; width: 100%;
  padding: 8px 12px; border: none; background: transparent;
  color: var(--text); font-size: 13px; font-family: inherit;
  cursor: pointer; border-radius: 8px; transition: background 0.15s;
}
.popover-action:hover { background: rgba(128,128,128,0.08); }
.popover-action svg { flex-shrink: 0; }
.popover-divider { height: 1px; background: var(--border); margin: 4px 0; }
.popover-section-label {
  font-size: 10px; font-weight: 600; letter-spacing: 0.08em;
  color: var(--text-muted); padding: 6px 12px 4px;
}
.popover-pro-row {
  padding: 2px 12px 4px;
}
.popover-hint {
  font-size: 11px; color: var(--text-muted); padding: 0 12px 6px;
  line-height: 1.4; opacity: 0.7;
}
.popover-book-item {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 8px; cursor: pointer;
  font-size: 13px; color: var(--text); transition: background 0.15s;
}
.popover-book-item:hover { background: rgba(128,128,128,0.08); }
.popover-book-item.selected { background: var(--accent-light); }
.popover-book-check {
  width: 16px; height: 16px; border-radius: 4px;
  border: 1.5px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 11px; transition: all 0.15s;
}
.popover-book-item.selected .popover-book-check {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.popover-empty {
  padding: 12px; font-size: 12px; color: var(--text-muted); text-align: center;
}
.composer-popover-down {
  bottom: auto; top: 100%; margin-bottom: 0; margin-top: 8px;
}

/* ─── Selected book chips ─── */
.selected-chips { display: flex; gap: 6px; flex-wrap: wrap; padding-bottom: 4px; }
.selected-chips:empty { display: none; padding: 0; }
.book-chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 6px 3px 10px; border-radius: 999px;
  background: var(--accent-light); color: var(--accent);
  font-size: 12px; font-weight: 500;
}
.chip-remove {
  width: 18px; height: 18px; border-radius: 50%; border: none;
  background: transparent; color: var(--accent); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; line-height: 1; opacity: 0.6; transition: opacity 0.15s;
}
.chip-remove:hover { opacity: 1; }

/* Book / Mind lists in popover */
.popover-book-list { max-height: 180px; overflow-y: auto; }
.popover-mind-list { max-height: 180px; overflow-y: auto; }
.popover-mind-item {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 12px; border-radius: 8px; cursor: pointer;
  font-size: 13px; color: var(--text); transition: background 0.15s;
}
.popover-mind-item:hover { background: rgba(128,128,128,0.08); }
.popover-mind-item.selected { background: var(--accent-light); }
.popover-mind-check {
  width: 16px; height: 16px; border-radius: 4px;
  border: 1.5px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 11px; transition: all 0.15s;
}
.popover-mind-item.selected .popover-mind-check {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.popover-mind-item.locked {
  opacity: 0.45;
  cursor: default;
}
.popover-mind-item.locked:hover {
  background: rgba(128,128,128,0.04);
}
.popover-pro-badge {
  font-size: 9px;
  font-weight: 700;
  font-family: inherit;
  letter-spacing: 0.03em;
  padding: 2px 8px;
  border: none;
  border-radius: 99px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  transition: all 0.15s;
  line-height: 1.4;
}
.popover-pro-badge:hover {
  opacity: 0.85;
  filter: brightness(1.15);
}
.popover-pro-label {
  font-weight: 800;
  margin-right: 1px;
}
.popover-mind-avatar {
  width: 22px; height: 22px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 9px; font-weight: 700; color: #fff; flex-shrink: 0;
}

/* Mind chips */
.mind-chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 6px 3px 4px; border-radius: 999px;
  background: rgba(100,120,180,0.1); color: var(--text-secondary);
  font-size: 12px; font-weight: 500;
}
.mind-chip-avatar {
  width: 18px; height: 18px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 8px; font-weight: 700; color: #fff; flex-shrink: 0;
}

/* ─── Shared ─── */
.empty-state {
  text-align: center; padding: 48px 20px;
  color: var(--text-muted); grid-column: 1 / -1;
}
.search-discover-prompt {
  grid-column: 1 / -1; text-align: center; padding: 40px 20px; color: var(--text-muted);
}
.search-discover-prompt p { margin-bottom: 12px; font-size: 14px; }
.search-discover-btn {
  padding: 8px 20px; border-radius: 999px; border: 1px solid var(--accent);
  background: transparent; color: var(--accent); font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all 0.15s;
}
.search-discover-btn:hover { background: var(--accent); color: #fff; }
.search-discover-btn:disabled { opacity: 0.5; pointer-events: none; }
.loading-dot { display: inline-block; font-size: 12px; color: var(--text-muted); animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:.3} 50%{opacity:1} }

/* ─── Chats page ─── */
.chats-page {
  flex: 1; display: flex; flex-direction: column;
  background: var(--bg-home); overflow-y: auto;
}
.chats-content {
  max-width: 640px; margin: 0 auto;
  padding: 32px 32px 64px;
  width: 100%;
}
.chats-title-row {
  display: flex; align-items: center; justify-content: space-between;
}
.chats-title-row .page-title { margin-bottom: 16px; }
.chats-header {
  margin-bottom: 16px;
}
.chats-search {
  width: 100%; padding: 10px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 10px; outline: none;
  background: var(--bg-chat);
  font-size: 14px; font-family: inherit;
  color: var(--text);
}
.chats-search::placeholder { color: var(--text-muted); }
.chats-new-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 16px; border-radius: 10px;
  border: none; background: var(--btn-solid-bg); color: var(--btn-solid-color);
  font-size: 13px; font-weight: 600; font-family: inherit;
  cursor: pointer; white-space: nowrap;
  transition: opacity 0.15s;
}
.chats-new-btn:hover { opacity: 0.85; }
.chats-new-btn svg { flex-shrink: 0; }
.chats-list {
  display: flex; flex-direction: column; gap: 2px;
}
.chats-list-item {
  display: flex; align-items: center;
  padding: 12px 14px; border-radius: 10px;
  cursor: pointer; transition: background 0.15s;
  font-size: 14px; color: var(--text);
}
.chats-list-item:hover { background: rgba(128,128,128,0.08); }
.chats-item-body {
  flex: 1; min-width: 0; cursor: pointer;
}
.chats-list-item .chat-item-title {
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chats-item-time {
  font-size: 11px; color: var(--text-muted); margin-top: 2px;
}
.chats-list-item .chat-item-icon {
  flex-shrink: 0; color: var(--text-muted); margin-right: 10px;
}
.chats-delete-btn {
  flex-shrink: 0; width: 28px; height: 28px;
  border: none; background: transparent; color: var(--text-muted);
  font-size: 16px; cursor: pointer; border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.15s;
}
.chats-list-item:hover .chats-delete-btn { opacity: 0.6; }
.chats-delete-btn:hover { opacity: 1 !important; color: var(--delete-color); background: rgba(255,69,58,0.08); }
.chats-empty {
  padding: 48px 16px; text-align: center;
  font-size: 13px; color: var(--text-muted);
}

/* ─── Topic tags (library page) ─── */
.topic-tags-grid {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: 28px;
}
.topic-tags-grid:empty { display: none; }
.topic-tag {
  padding: 7px 16px; border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: transparent; color: var(--text-muted);
  cursor: pointer; font-size: 13px; font-weight: 500; font-family: inherit;
  transition: all 0.15s; display: inline-flex; align-items: center;
}
.topic-tag:hover { color: var(--text); border-color: rgba(128,128,128,0.3); }
.topic-tag.active { background: var(--btn-solid-bg); color: var(--btn-solid-color); border-color: var(--btn-solid-bg); }
.topic-tag.loading { opacity: 0.5; pointer-events: none; }
.topic-tag-clear {
  color: var(--text-muted); border-color: transparent;
  font-size: 12px; background: transparent;
}
.topic-tag-clear:hover { color: var(--accent); }
/* Discover bar — between topic tags and book grid */
.library-discover-bar {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  margin-bottom: 20px;
  border-radius: 10px;
  background: var(--accent-light);
  border: 1px solid color-mix(in srgb, var(--accent) 15%, transparent);
}
.library-discover-bar.hidden { display: none !important; }
.discover-bar-text {
  font-size: 13px; color: var(--text-secondary); flex: 1;
}
.discover-bar-text strong { color: var(--text); font-weight: 600; }
.discover-bar-btn {
  padding: 6px 16px; border-radius: 999px; border: none;
  background: var(--accent); color: #fff;
  font-size: 12px; font-weight: 600; cursor: pointer;
  font-family: inherit; transition: opacity 0.15s;
  white-space: nowrap;
}
.discover-bar-btn:hover { opacity: 0.85; }
.discover-bar-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Discover more card */
.discover-more-card { border-style: dashed; opacity: 0.7; }
.discover-more-card:hover { opacity: 1; }

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .chat-sidebar-right, .book-sidebar-left { display: none !important; }
  .chat-messages { padding: 20px 16px; }
  .chat-input-area { padding: 12px 16px 16px; }
  .app-sidebar { position: fixed; left: 0; top: 0; bottom: 0; z-index: 100; }
  .app-layout.sidebar-collapsed .app-sidebar { width: 0; border-right: none; }
  .app-layout.sidebar-collapsed .sidebar-float-btn { display: flex; }
}
@media (max-width: 720px) {
  .home-center { padding: 0 16px; }
  .greeting { font-size: 28px; }
  .library-content { padding: 16px 16px 48px; }
  .chats-content { padding: 16px 16px 48px; }
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .card-cover, .card-cover-placeholder { height: 160px; }
}

/* ─── Skill badge (on chat messages) ─── */
.skill-badge {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.skill-rag { background: var(--skill-rag-bg); color: var(--skill-rag-color); }
.skill-content_fetch { background: var(--skill-content-bg); color: var(--accent); }
.skill-web_search { background: var(--skill-web-bg); color: var(--skill-web-color); }
.skill-llm_knowledge { background: var(--skill-llm-bg); color: var(--text-muted); }

/* Token usage */
.token-usage {
  font-size: 11px; color: var(--text-muted); opacity: 0.6;
  margin-top: 6px;
}
.token-toast {
  position: fixed; bottom: 24px; right: 24px;
  padding: 6px 14px; border-radius: 8px;
  background: var(--bg-sidebar); border: 1px solid var(--border);
  font-size: 11px; color: var(--text-muted);
  box-shadow: var(--shadow-sm); z-index: 200;
  transition: opacity 0.3s;
}
.token-toast.fade-out { opacity: 0; }

/* ─── Great Minds ─── */
.minds-page {
  position: relative;
  overflow: hidden;
  flex: 1;
  height: 100%;
}
.minds-graph-toolbar {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 10px;
  align-items: center;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  padding: 8px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.minds-graph-toolbar input {
  width: 220px;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-chat);
  font-size: 13px;
  color: var(--text);
  outline: none;
}
.minds-graph-toolbar input::placeholder { color: var(--text-muted); }
.minds-graph-toolbar input:focus { border-color: var(--accent); }
.minds-add-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-chat);
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}
.minds-add-btn:hover { border-color: var(--accent); color: var(--accent); }
.minds-add-btn svg { stroke: currentColor; }
.minds-tagline {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  font-size: 12px;
  font-style: italic;
  color: var(--text-muted);
  letter-spacing: 0.01em;
  pointer-events: none;
  white-space: nowrap;
}
.minds-graph {
  width: 100%;
  height: 100%;
  cursor: grab;
  background: var(--canvas-bg);
  border-radius: 0;
}
.minds-graph:active { cursor: grabbing; }
.minds-graph canvas { display: block; }

.minds-tooltip {
  position: absolute;
  z-index: 20;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.10);
  max-width: 300px;
  pointer-events: auto;
  transition: opacity 0.15s;
}
.minds-tooltip.hidden { display: none; }
.minds-tooltip .tt-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
}
.minds-tooltip .tt-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}
.minds-tooltip .tt-era {
  font-size: 11px;
  color: var(--text-muted);
}
.minds-tooltip .tt-chat-icon-btn {
  flex-shrink: 0;
  padding: 4px 10px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  font-family: inherit;
  transition: all 0.15s;
}
.minds-tooltip .tt-chat-icon-btn:hover {
  opacity: 0.85;
}
.minds-tooltip .tt-domains {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}
.minds-tooltip .tt-domain-tag {
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--bg-sidebar);
  color: var(--text-secondary);
}
.minds-tooltip .tt-bio {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.minds-tooltip .tt-action {
  margin-top: 8px;
  font-size: 11px;
  color: var(--accent);
  font-weight: 500;
}
.minds-tooltip .tt-discover-btn {
  margin-top: 6px; padding: 4px 10px;
  font-size: 11px; font-weight: 500; font-family: inherit;
  color: var(--accent); background: var(--accent-light);
  border: 1px solid var(--border); border-radius: 6px;
  cursor: pointer; transition: all 0.15s;
}
.minds-tooltip .tt-discover-btn:hover {
  background: var(--accent); color: #fff;
}

.graph-onboarding-hint {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) translateY(8px);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 20px;
  background: rgba(255,255,255,0.45);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border: 1px solid rgba(255,255,255,0.5);
  box-shadow: 0 2px 16px rgba(0,0,0,0.06), 0 0 0 0.5px rgba(0,0,0,0.04);
  color: var(--text-secondary, #6e6e73);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.01em;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.6s ease;
  z-index: 15;
  white-space: nowrap;
}
.graph-onboarding-hint.visible {
  opacity: 1;
  transform: translate(-50%, -50%);
}
.graph-onboarding-hint svg {
  flex-shrink: 0;
  opacity: 0.45;
}
.graph-onboarding-hint strong {
  font-weight: 600;
  color: var(--text, #1d1d1f);
}

@media (prefers-color-scheme: dark) {
  :root:not(.light) .graph-onboarding-hint {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.12);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3), 0 0 0 0.5px rgba(255,255,255,0.06);
    color: rgba(255,255,255,0.55);
  }
  :root:not(.light) .graph-onboarding-hint strong {
    color: rgba(255,255,255,0.8);
  }
}
:root.dark .graph-onboarding-hint {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.12);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3), 0 0 0 0.5px rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.55);
}
:root.dark .graph-onboarding-hint strong {
  color: rgba(255,255,255,0.8);
}

/* Keep mind-avatar for detail page & perspectives */
.mind-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  flex-shrink: 0;
}
.mind-domain-tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-sidebar);
  color: var(--text-secondary);
}
.mind-chat-btn {
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}
.mind-chat-btn:hover { background: var(--bg-sidebar); }

/* Mind detail / chat page */
.mind-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-chat);
}
.mind-page .page-nav {
  flex-shrink: 0;
}
.mind-page .mind-detail-layout {
  flex: 1;
  display: flex;
  overflow: hidden;
}
.mind-page .mind-detail-layout > .chat-sidebar-right {
  display: block;
}
.mind-inline-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.mind-inline-info h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 0;
}
.mind-inline-info p {
  font-size: 13px;
  color: var(--text-muted);
  margin: 2px 0 0;
}

/* Mind messages in chat timeline */
.mind-message {
  background: transparent !important;
  padding: 4px 0 !important;
  margin: 0 0 16px !important;
  border-radius: 0 !important;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.mind-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  margin-top: 2px;
}
.mind-msg-body {
  flex: 1;
  min-width: 0;
}
.mind-msg-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  line-height: 1;
  margin-bottom: 4px;
}
.mind-msg-content {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Join / system notices */
.chat-system-notice {
  display: flex;
  justify-content: center;
  padding: 8px 0;
}
.join-notice-inner {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-sidebar);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
}
.join-avatar {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.minds-loading-notice .loading-dot {
  font-style: italic;
}

/* Legacy perspectives (deprecated) */
.perspectives-actions {
  display: flex;
  gap: 8px;
  padding: 8px 14px;
  border-top: 1px solid var(--border);
  background: var(--bg-sidebar);
}
.perspectives-actions button {
  font-size: 12px;
  color: var(--text-muted);
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 12px;
  cursor: pointer;
}
.perspectives-actions button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Add mind dialog */
.mind-add-dialog {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
}
.mind-add-form {
  background: var(--dialog-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px 24px;
  width: 380px;
  max-width: 90vw;
  box-shadow: 0 8px 40px rgba(0,0,0,0.18);
}
.mind-add-form-rich {
  width: 420px;
  padding: 32px 28px 28px;
  animation: mindAddIn 0.25s ease-out;
}
@keyframes mindAddIn {
  from { opacity: 0; transform: translateY(12px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.mind-add-header {
  text-align: center;
  margin-bottom: 20px;
}
.mind-add-neural {
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mind-add-form h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  font-family: 'Libre Baskerville', Georgia, serif;
}
.mind-add-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
}
.mind-add-desc strong {
  color: var(--accent);
  font-weight: 600;
}
.mind-add-form input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 12px;
  background: var(--bg-chat);
  color: var(--text);
  outline: none;
  box-sizing: border-box;
}
.mind-add-form input:focus { border-color: var(--accent); }
.mind-add-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}
.mind-add-actions button {
  padding: 8px 20px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-chat);
  color: var(--text);
  font-family: inherit;
  transition: all 0.15s;
}
.mind-add-actions button:hover {
  background: rgba(128,128,128,0.08);
}
.mind-add-actions .primary-btn {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.mind-add-actions .primary-btn:hover {
  opacity: 0.9;
  background: var(--accent);
}
.mind-add-actions .primary-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* ═══════════════════════════════════════
   PRO UPGRADE OVERLAY
   ═══════════════════════════════════════ */
.pro-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.pro-overlay.visible { opacity: 1; }
.pro-overlay-inner {
  position: relative;
  background: var(--bg-home);
  border-radius: 20px;
  border: 1px solid var(--border);
  box-shadow: 0 16px 64px rgba(0, 0, 0, 0.25);
  max-width: 760px;
  width: 92vw;
  max-height: 90vh;
  overflow-y: auto;
}
.pro-overlay-close {
  position: absolute;
  top: 16px; right: 20px;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-chat);
  color: var(--text-muted);
  font-size: 22px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all 0.15s;
  line-height: 1;
}
.pro-overlay-close:hover {
  background: var(--border);
  color: var(--text);
}

/* ═══════════════════════════════════════
   SUBSCRIPTION PAGE
   ═══════════════════════════════════════ */
.subscription-page {
  flex: 1; display: flex; flex-direction: column;
  background: var(--bg-home); overflow-y: auto;
}
.sub-page {
  max-width: 720px; width: 100%;
  margin: 0 auto; padding: 48px 32px 64px;
}
.sub-loading {
  display: flex; align-items: center; justify-content: center;
  min-height: 200px;
}
.sub-header {
  text-align: center; margin-bottom: 48px;
}
.sub-title {
  font-size: 28px; font-weight: 400;
  font-family: 'Libre Baskerville', Georgia, serif;
  color: var(--text); margin-bottom: 8px;
}
.sub-subtitle {
  font-size: 14px; color: var(--text-muted);
}

.sub-cards {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px; margin-bottom: 48px;
}
.sub-card {
  background: var(--bg-chat);
  border: 1px solid var(--border);
  border-radius: 14px;
  display: flex; flex-direction: column;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.sub-card:hover { box-shadow: var(--shadow-sm); }
.sub-card-active { border-color: var(--border-strong); }

.sub-card-pro {
  background: var(--bg-chat);
  border-color: var(--accent);
}
.sub-card-pro:hover { box-shadow: var(--shadow-md); }
.sub-card-pro.sub-card-active { border-color: var(--accent); }

.sub-card-head {
  padding: 24px 24px 16px;
}
.sub-plan-name {
  display: flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 600;
  margin-bottom: 10px;
}
.sub-badge {
  font-size: 10px; font-weight: 600;
  padding: 2px 8px; border-radius: 99px;
  background: var(--border-strong); color: var(--text-muted);
  letter-spacing: 0.02em;
}
.sub-badge-pro {
  background: var(--accent); color: #fff;
}
.sub-card-active .sub-badge-pro {
  background: var(--accent); color: #fff;
}
.sub-price {
  font-size: 32px; font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}
.sub-price span {
  font-size: 14px; font-weight: 400;
  color: var(--text-muted);
}
.sub-price-note {
  font-size: 12px; color: var(--text-muted);
  margin-top: 4px;
}

.sub-card-body {
  flex: 1; padding: 0 24px 8px;
}
.sub-feature-row {
  display: flex; align-items: baseline; gap: 10px;
  padding: 6px 0;
}
.sub-feature-check {
  font-size: 14px; color: var(--text-muted); flex-shrink: 0;
}
.sub-feature-check.pro-check {
  color: var(--accent);
}
.sub-feature-label {
  font-size: 13.5px; color: var(--text-secondary); line-height: 1.45;
}

.sub-card-foot {
  padding: 12px 24px 24px;
}
.sub-btn {
  display: block; width: 100%;
  padding: 11px 16px; border-radius: 10px;
  font-size: 14px; font-weight: 600;
  font-family: inherit; cursor: pointer;
  border: none; transition: all 0.15s;
  text-align: center;
}
.sub-btn-primary {
  background: var(--btn-solid-bg); color: var(--btn-solid-color);
}
.sub-btn-primary:hover { opacity: 0.85; }
.sub-btn-secondary {
  background: var(--bg-sidebar); color: var(--text-muted);
  cursor: default; opacity: 0.6;
}
.sub-btn-manage {
  background: var(--accent-light); color: var(--accent);
  border: 1px solid var(--border);
}
.sub-btn-manage:hover { background: var(--source-tag-hover); }
.sub-btn-signin {
  background: var(--btn-solid-bg); color: var(--btn-solid-color);
  max-width: 320px; margin: 0 auto;
}
.sub-btn-signin:hover { opacity: 0.85; }
.sub-cancel-note {
  text-align: center; font-size: 12px;
  color: var(--text-muted); margin-top: 8px;
}

.sub-footer {
  text-align: center; padding-top: 8px;
}
.sub-email {
  font-size: 13px; color: var(--text-muted); margin-bottom: 10px;
}
.sub-signout-btn {
  padding: 8px 20px; border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent; color: var(--text-muted);
  font-size: 13px; font-weight: 500;
  font-family: inherit; cursor: pointer;
  transition: all 0.15s;
}
.sub-signout-btn:hover {
  color: var(--delete-color); border-color: var(--delete-color);
  background: rgba(255,69,58,0.06);
}

@media (max-width: 720px) {
  .sub-cards { grid-template-columns: 1fr; }
  .sub-page { padding: 24px 16px 48px; }
}


/* ═══════════════════════════════════════
   LANDING PAGE
   ═══════════════════════════════════════ */
.app-layout.landing-active .app-sidebar,
.app-layout.login-active .app-sidebar { display: none !important; }
.app-layout.landing-active .sidebar-float-btn,
.app-layout.login-active .sidebar-float-btn { display: none !important; }

.landing-page {
  flex: 1; display: flex; flex-direction: column;
  overflow-y: auto; overflow-x: hidden;
  background: var(--landing-bg);
}
.lp-container {
  width: 100%;
}

/* Top bar */
.lp-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--landing-topbar-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.lp-topbar-brand {
  font-family: 'Libre Baskerville', Georgia, serif;
  font-size: 17px;
  font-weight: 400;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 7px;
}
.lp-topbar-cta {
  padding: 6px 16px;
  font-size: 12px;
  font-weight: 500;
  font-family: inherit;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.15s;
}
.lp-topbar-cta:hover {
  background: var(--btn-solid-bg);
  color: var(--btn-solid-color);
  border-color: var(--btn-solid-bg);
}
.lp-topbar-actions {
  display: flex; align-items: center; gap: 10px;
}

/* Theme toggle buttons */
.lp-theme-toggle,
.sidebar-theme-toggle {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
  padding: 0;
}
.lp-theme-toggle:hover,
.sidebar-theme-toggle:hover {
  background: var(--border);
  color: var(--text);
}
.lp-icon-moon,
.icon-moon { display: none; }
:root.dark .lp-icon-sun,
:root.dark .icon-sun { display: none; }
:root.dark .lp-icon-moon,
:root.dark .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not(.light) .lp-icon-sun,
  :root:not(.light) .icon-sun { display: none; }
  :root:not(.light) .lp-icon-moon,
  :root:not(.light) .icon-moon { display: block; }
}
.sidebar-theme-toggle {
  width: 32px; height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Discord link (landing topbar) */
.lp-discord-link {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all 0.15s;
  flex-shrink: 0;
}
.lp-discord-link:hover {
  background: var(--border);
  color: #5865F2;
}

/* Fullscreen hero — minds as background */
.lp-fullscreen {
  position: relative;
  width: 100%;
  height: calc(100vh - 52px);
  min-height: 560px;
  overflow: hidden;
}
.lp-bg-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.lp-bg-canvas canvas { display: block; }

/* Minds toolbar floating on background */
.lp-minds-toolbar {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  gap: 8px;
  align-items: center;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  padding: 6px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
.lp-minds-toolbar input {
  width: 180px;
  padding: 5px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-chat);
  font-size: 12px;
  color: var(--text);
  outline: none;
  font-family: inherit;
}
.lp-minds-toolbar input::placeholder { color: var(--text-muted); }
.lp-minds-toolbar input:focus { border-color: var(--accent); }
.lp-minds-toolbar-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-chat);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: default;
  white-space: nowrap;
  font-family: inherit;
  opacity: 0.7;
}
.lp-minds-toolbar-btn svg { stroke: currentColor; }

/* Centered foreground content — left/right layout */
.lp-fg-center {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding: 0 4% 0 6%;
  gap: 40px;
  pointer-events: none;
}
.lp-fg-center > * { pointer-events: auto; }

/* Left: hero text */
.lp-hero-left {
  flex: 0 0 auto;
  min-width: 340px;
  max-width: 380px;
  position: relative;
  z-index: 1;
}
.lp-hero-left::before {
  content: '';
  position: absolute;
  inset: -60px -80px;
  z-index: -1;
  background: radial-gradient(ellipse at center, var(--landing-bg) 0%, transparent 70%);
  pointer-events: none;
}
.lp-hero-headline {
  font-family: 'Libre Baskerville', Georgia, serif;
  font-size: 30px;
  font-weight: 400;
  color: var(--text);
  line-height: 1.3;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
  text-align: left;
}
.lp-hero-sub {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0;
  text-align: left;
}
.lp-hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  color: var(--btn-solid-color);
  background: var(--btn-solid-bg);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
}
.lp-hero-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.18);
  filter: brightness(1.08);
}
.lp-hero-cta:active {
  transform: translateY(0);
  box-shadow: 0 1px 6px rgba(0,0,0,0.10);
}
.lp-hero-cta svg {
  stroke: currentColor;
  flex-shrink: 0;
}

/* Right: Chat card — frosted glass */
.lp-chat-card {
  flex: 1 1 auto;
  max-width: 620px;
  height: min(520px, calc(100vh - 140px));
  background: rgba(255,255,255,0.18);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 16px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.03), inset 0 1px 0 rgba(255,255,255,0.15);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
html.light .lp-chat-card {
  background: rgba(255,255,255,0.22);
  border-color: rgba(255,255,255,0.2);
  box-shadow: 0 8px 40px rgba(0,0,0,0.04), inset 0 1px 0 rgba(255,255,255,0.2);
}
html.dark .lp-chat-card {
  background: rgba(44,44,46,0.2);
  border-color: rgba(255,255,255,0.04);
  box-shadow: 0 8px 40px rgba(0,0,0,0.15), inset 0 1px 0 rgba(255,255,255,0.03);
}
@media (prefers-color-scheme: dark) {
  html:not(.light) .lp-chat-card {
    background: rgba(44,44,46,0.2);
    border-color: rgba(255,255,255,0.04);
    box-shadow: 0 8px 40px rgba(0,0,0,0.15), inset 0 1px 0 rgba(255,255,255,0.03);
  }
}

/* Home state */
.lp-chat-home {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 28px;
}
.lp-chat-home-inner {
  max-width: 520px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.lp-starters-compact { flex-wrap: wrap; }
.lp-starters-compact .starter-pill { font-size: 11px; padding: 6px 12px; }

/* Active chat state */
.lp-chat-active {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: opacity 0.3s;
}
.lp-chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scrollbar-width: thin;
  scrollbar-color: rgba(128,128,128,0.15) transparent;
}
.lp-chat-input-area {
  padding: 6px 24px 10px;
  flex-shrink: 0;
}
.lp-chat-input-area .chat-composer-inline { margin: 0 auto; }
.lp-active-textarea {
  min-height: 20px !important;
  max-height: 36px !important;
  padding-top: 6px !important;
  padding-bottom: 6px !important;
}

.lp-composer {
  pointer-events: none;
  background: rgba(128,128,128,0.08) !important;
  border-color: rgba(128,128,128,0.15) !important;
  box-shadow: none !important;
}
.lp-composer .composer-input {
  background: transparent;
}
.lp-cta-primary {
  padding: 14px 32px;
  border-radius: 12px;
  border: none;
  background: var(--btn-solid-bg);
  color: var(--btn-solid-color);
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}
.lp-cta-primary:hover {
  opacity: 0.85;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.lp-cta-secondary {
  padding: 14px 28px;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}
.lp-cta-secondary:hover {
  border-color: var(--text);
  background: rgba(128,128,128,0.06);
}
.lp-hero-note {
  font-size: 12px; color: var(--text-muted);
  text-align: center;
}

/* Demo area (kept for message styling compatibility) */
.lp-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 13px;
  line-height: 1.6;
  word-break: break-word;
}
.lp-msg-user {
  align-self: flex-end;
  background: var(--lp-msg-user-bg);
  color: var(--text);
  font-weight: 500;
  border-bottom-right-radius: 4px;
}
.lp-msg-assistant {
  align-self: flex-start;
  background: transparent;
  color: var(--text-secondary);
  padding-left: 0;
  padding-right: 0;
}

/* Source tags */
.lp-msg-sources {
  display: flex; flex-wrap: wrap; gap: 4px;
  margin-top: 8px;
}
.lp-source-tag {
  font-size: 10px; font-weight: 500;
  padding: 3px 8px; border-radius: 99px;
  background: var(--source-tag-bg); color: var(--accent);
}

/* System notice (loading, join) */
.lp-system-notice {
  display: flex; justify-content: center;
  padding: 4px 0;
}
.lp-join-inner {
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; color: var(--text-muted);
  padding: 5px 14px;
  background: var(--lp-join-bg); border-radius: 20px;
  border: 1px solid var(--border);
}
.lp-system-notice .loading-dot {
  font-size: 11px; font-style: italic;
  color: var(--text-muted);
  padding: 5px 14px;
  background: var(--lp-join-bg); border-radius: 20px;
  border: 1px solid var(--border);
}
.lp-mn-avatar {
  width: 18px; height: 18px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 7px; font-weight: 700; color: #fff;
  flex-shrink: 0;
}
.lp-msg-mind > .lp-mn-avatar {
  width: 26px; height: 26px;
  font-size: 9px;
  margin-top: 1px;
}
.lp-mn-name {
  font-weight: 600; color: var(--text-secondary);
}

/* Mind message */
.lp-msg-mind {
  align-self: flex-start;
  background: transparent;
  border-radius: 0;
  padding: 2px 0;
  max-width: 100%;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.lp-mind-header {
  display: flex; align-items: center; gap: 6px;
  margin-bottom: 2px;
}
.lp-mind-header .lp-mn-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.lp-mind-body-wrap {
  flex: 1; min-width: 0;
}
.lp-mind-body {
  font-size: 13px; line-height: 1.6;
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 960px) {
  .lp-fg-center { flex-direction: column; padding: 0 16px; gap: 20px; }
  .lp-hero-left { flex: 0 0 auto; max-width: 100%; text-align: center; }
  .lp-hero-left::before { inset: -30px -40px; }
  .lp-hero-headline { font-size: 22px; text-align: center; }
  .lp-hero-sub { text-align: center; }
  .lp-hero-cta { margin: 20px auto 0; }
  .lp-chat-card { flex: 0 0 auto; max-width: 100%; height: 380px; }
  .lp-minds-toolbar-btn { display: none; }
  .lp-minds-toolbar input { width: 140px; }
}